[jira] [Created] (FLINK-3254) CombineFunction interface not respected

["Fabian Hueske (JIRA)" <ji...@apache.org>]

Fabian Hueske created FLINK-3254:
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             Summary: CombineFunction interface not respected
                 Key: FLINK-3254
                 URL: https://issues.apache.org/jira/browse/FLINK-3254
             Project: Flink
          Issue Type: Bug
          Components: DataSet API
    Affects Versions: 0.10.1, 1.0.0
            Reporter: Fabian Hueske
            Priority: Blocker
             Fix For: 1.0.0


The DataSet API offers a {{CombineFunction}} interface, which differs from the {{GroupCombineFunction}} interface by being restricted to return a single value instead of returning arbitrary many values through a {{Collector}}.
The JavaDocs of the {{GroupCombineFunction}} point to the {{CombineFunction}} interface, advertising it as more efficient.

However, the {{CombineFunction}} interface is nor respected by Flink, i.e., a {{GroupReduceFunction}} that implements this interface is executed without leveraging the combine method.



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